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x in (-oo:+oo)
1/6-((2*x)/3)+4 = 2*x // - 2*x
1/6-((2*x)/3)-(2*x)+4 = 0
(-2/3)*x-2*x+1/6+4 = 0
25/6-8/3*x = 0 // - 25/6
-8/3*x = -25/6 // : -8/3
x = -25/6/(-8/3)
x = 25/16
x = 25/16
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